Police say Murillo turned himself in yesterday. He was arraigned today in Boston Municipal Court on charges of assault and battery with a dangerous weapon; Judge Annette Forde set bail at $25,000 and ordered Murillo to stay away from his two victims, the Suffolk County District Attorney's office reports.

The DA's office provided this account:

Prosecutors said Murillo was yelling and making obscene gestures at a group of passengers on a southbound Red Line train. Among those passengers were two men who boarded the train at Park Street but exited at the next stop in an attempt to escape from the defendant.

According to prosecutors, Murillo followed the men off the train. After exchanging words with the victims, prosecutors said, Murillo punched the first victim and cut the man on the wrist. Murillo allegedly stabbed the second victim in the chest when that man tried to intervene, prosecutors said. The stab wound punctured the man's lung and liver. Both men were transported to Massachusetts General Hospital and are expected to survive.